Regular copolyamides as desalination membranes

Details Regular copolyamides as desalination membranes Regular copolyamides as desalination membranes

1975-05-23

1977-01-11

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210500M, B01D 1300

Patent

active

040025632

ABSTRACT:
Regular copolyamides of the formula ##STR1## WHERE X IS 2 TO 10, Y IS 0 TO 8, R is a divalent aliphatic or aromatic radical having 1 to 34 carbon atoms, and n is not less than 10, are prepared by reacting an aliphatic diester with an excess of an aliphatic diamine to form a diamine diamide, and reacting the diamine diamide intermediate with an aliphatic or aromatic diacid chloride.
Permselective membranes prepared from the copolyamides find particular utility in desalination of water by reverse osmosis.

REFERENCES:
patent: 3423491 (1969-01-01), McLain et al.
patent: 3472766 (1969-10-01), Rosenbaum
patent: 3526588 (1970-09-01), Michaels et al.
patent: 3660281 (1970-05-01), Tober

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